Playback

/ns play <name> [player]

Needs nonscene.play. Playing for someone else also needs nonscene.play.others. From the console the player argument is required.

What happens

The chunks along the path are loaded.
The screen fades out (see Fades).
The viewer is hidden from other players, made to fly and teleported to the start of the path. They now look through a camera that exists only in their own client: no hotbar, no hand, no way to look around.
The camera follows the path, updated update-rate times per second on its own thread. Timeline events fire as their time comes.
The screen fades out again, the player is put back exactly where they started, with their flight state restored, and fades back in.

The player entity follows the camera on the server so that chunks keep loading and sounds and particles are heard and seen. Cutscenes may cross worlds.

Restrictions for the viewer

While watching, a player can’t:

move horizontally, interact with blocks, entities or armor stands
open, click or drag in inventories, drop, pick up or swap items
deal or take damage or get hungry
leave a vehicle
run any command except /ns stop, /ns skip, /ns pause, /ns resume (other commands are also hidden from tab completion)

Skip, pause, stop

Action	How	Permission
Skip	`/ns skip [player]` or sneak	`nonscene.skip`, `nonscene.skip.others`
Pause / resume	`/ns pause [player]`, `/ns resume [player]`	`nonscene.pause`, `nonscene.pause.others`
Stop	`/ns stop`	`nonscene.stop`

Skip ends the cutscene as completed: console and player events that haven’t fired run right away. Sneak-to-skip can be turned off with cutscene.playback.skip-on-sneak: false.
Pause freezes both the camera and the timeline. It works only while the camera moves, not during the fades around it.
Stop cancels the cutscene, remaining events don’t run.

Fades

cutscene:
  playback:
    fade:
      mode: BLINDNESS
      out-ticks: 10   # fade to black
      hold-ticks: 10  # stay black while the camera switches
      in-ticks: 20    # fade back in
      title-glyph: ""

Mode	Effect
`NONE`	Hard cut.
`BLINDNESS`	Blindness fog. Works without a resource pack, the client eases out of it on its own.
`TITLE`	Shows `title-glyph` as a title, faded with the given timings. Use a full-screen black glyph from your resource pack for a true smooth fade, e.g. `"<font:mypack:fade></font>"`.

TITLE without a title-glyph falls back to BLINDNESS with a warning in the log.

Camera height

cutscene.playback.eye-height (default 1.62) is added to the recorded feet position. 1.62 matches a standing player’s eyes, so a recording looks the same as what you saw while recording.

If the server stops mid-cutscene

The viewer’s starting location and flight state are stored on the player. If the server crashes or stops during a cutscene, the player is put back there when they join again.